If you only wore dresses (not skirts and tops), how many would you want? How often would you want to repeat?

I'm finding I don't want to wear the same dress within a two week span, so theoretically, I'd want about 15 day/work dresses. Given that summer here lasts a good 5 months, let's say that's 20 weeks, or 100 work days. Each dress would get worn an average of 6 or 7 times over the summer. If I upped it 20 dresses, they'd average 5 wears each. Hmmm ... I just ordered two more linen dresses from J Jill and was feeling guilty, but given that I wear one nearly every day in the summer, I now feel justified. Yay for girl math!

Over to you ... what kind of numbers would you want for an all dress summer wardrobe?